The relay contains some regular measurands that can be received as ASDU 4 or TypeID 4 change events through the Class 1 buffer. All these objects are disabled by default. They can be located in the point list and enabled through PCM600.
Depending on the relay configuration, the internal fault record can register various start current and voltage and maximum current and voltage values during a fault situation. The fault reactance and distance to fault can also be registered, providing that the relay variant supports the fault locator function. The fault record data is available as ASDU 4 Class 1 objects. All these objects are disabled by default. They can be located in the point list and enabled through PCM600.
Fault records
The fault record needs to be separately configured for the desired registration actions. For example, registrations can be defined to be made only in operate (trip) situation, or also at any start on/off situation. The fault record function component contains all registration object values that could have been used by the relay. It depends on the relay type and the relay configuration if a certain registration is made. Objects that are not registered remain constantly at value 0.
The fault record registers several values at the same time. All values belonging to the same fault get the same ASDU 4 event time stamp. This makes it easy to collect registrations belonging to the same fault situation.
ASDU 4 events can easily fill up the Class 1 event buffer, therefore the fault record can, for example, be configured to register only after an operate (trip) event. In such a case, the registration value events are generated and transmitted following the last “Breaker open” event when the relay is idle.